Need help in Spring tutorial form controller

<<<<<<<<<<< // Line 1: where this method is defined ?

Its a default method for ur controller !!

<<<<<<<< setCommandClass(User.class);
user.class is bean class ....

<<<<<<<<<<< setCommandName("user");

User is an customer defined command object.
U can use either command or user object in ur controller and form
U can give any name to command Class

If ur not use setCommandName("user");  then it will take  default commandName that is
command object .



<<<<<<< How  user object is sent  into   Object command  ?

U have the jsp right that properties value binded and get in the controller  purpose we are using command object

(textbox,dropdown etc values ) u can get throw command object

<spring:bind> or <form:input path="">for binding the value in jsp


<<<<<<<<< User user = (User) command;  

this is for costing the command object in to ur bean
then all bean value going to set !!

>>>>User is an customer defined command object.

I am not sure why we are saying this as "command" object  ...its just a class i see....any reason to say this class as command here ?



>>>If ur not use setCommandName("user");  then it will take  default commandName that is
command object .

what is that default commandName ?  is it  just the name of the command class i.e  User  ?

>>>U have the jsp right that properties value binded and get in the controller  purpose we are using command object

Suppose , if we did not  write  setCommandName("user");  then  default commandName will work upon ....right ?   what changes will be there in this  JSP then  and also in any other configuration ( if any)?  


<form:form method="POST" commandName="user">
   <table>
   <tr>
       <td>User Name :</td>
       <td><form:input path="name" /></td>
   </tr>
   <tr>
       <td>Password :</td>
       <td><form:password path="password" /></td>
   </tr>
   <tr>
       <td>Gender :</td>
       <td>
           <form:radiobutton path="gender" value="M" label="M" />
           <form:radiobutton path="gender" value="F" label="F" />
       </td>
   </tr>
   <tr>
       <td>Country :</td>
       <td>
       <form:select path="country">
           <form:option value="0" label="Select" />
           <form:option value="1" label="India" />
           <form:option value="2" label="USA" />
           <form:option value="3" label="UK" />
       </form:select></td>
   </tr>
   <tr>
       <td>About you :</td>
       <td><form:textarea path="aboutYou" /></td>
   </tr>
   <tr>
       <td>Community :</td>
       <td>
           <form:checkbox path="community" value="Spring" label="Spring" />
           <form:checkbox path="community" value="Hibernate" abel="Hibernate" />
           <form:checkbox path="community" value="Struts" label="Struts" />
       </td>
   </tr>
   <tr>
       <td></td>
       <td>
       <form:checkbox path="mailingList" label="Would you like to join our mailinglist?" /></td>
   </tr>
   <tr>
       <td colspan="2"><input type="submit"></td>
   </tr>
   </table>
   </form:form>

    </body>
   </html>

<<<<<<<<< I am not sure why we are saying this as "command" object ...its just a class i see....any reason to say this class as command here ?

as per spring command name is used to get the user input values from jsp in controller ..
so they are default provide one command name that is command ..

eg:

protected ModelAndView onSubmit(Object command) throws Exception

commandName is u can give any nmae like sathish ,cofactor like that u give user that it ...

<<<<<<<<<<Suppose , if we did not  write  setCommandName("user");  then  default commandName will work upon ....right ?   what changes will be there in this  JSP then  and also in any other configuration ( if any)?  


<form:form method="POST" commandName="user">

ya ur correct only it will take default command name but here in ur <form:form> does not know about ur command name so u must define the command name .

if u dont like to define means <form >

and inside use <spring:bind> u no need to define command name any where that take default command name !!

if u use <form:form> the u will define the command name ... for process purpose that want to know that !!

Ok ...feeling more comfortable  now.

still have a doubt  in the  Spring Bean Configuration file.

..................................
....................................
<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />  

I am confused with   p namespace in the above .


They say

"...
As you can see, we use "p" namespace here. The "p" namespace is simple and easy to use. Using "p" namespace the properties can be supplied using attributes, rather than elements.  
For injecting the simple types we use property name in the "p" namespace and for injecting references we add "-ref" suffix to it. For example we use p:formView for injecting the form view property and p:userService-ref for injecting the user service. ..."

I could not understand whats this p is all about . Can you explain with examples whats this p is doing here .  It looks bit complicated to me.  



what does this mean  by "  Using "p" namespace the properties can be supplied using attributes, rather than elements"  ???? example plz

In 2.5 and above we metion the XML shema  like this !! xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance

In 2.0 we mention like this
xmlns:p=http://www.springframework.org/schema/p

but both or same meaning only ....

In 2.5 and above we mention bean like thsi eg:

<bean id="posCreateIndustryController" class="com.rockwell.ap.spras.web.controller.PosCreateIndustryController">
<property name="commandName">
<value>PosBean</value>
</property>
<property name="commandClass">
<value>
business.model.XXXMasterBean
</value>
</property>
</bean>  

Not clear.

Let me post the doubt  ....

see the Bean Config File ...

<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />  


I see  p:formView="userForm"   but   in JSP there is no "userForm"   .....How its related to the jsp form then  ?



I see  p:userService-ref="userService"  ... Suppose we did write   p:userServiceref="abcdService"  instead ....if we do this wiill it still work   ?


I see  p:successView="userSuccess"   ......where  this  "userSuccess"    is used ?

 

<<<<<<I see  p:formView="userForm"   but   in JSP there is no "userForm"   .....How its related to the jsp form then  ?

dispatcherservlet u can find userForm  if its not there means thats pgm bug ....

<<<<<I see  p:userService-ref="userService"  ... Suppose we did write   p:userServiceref="abcdService"  instead ....if we do this wiill it still work   ?

I am not aware of  spring2.0 so i dont know abt this ?? bug !!

<<<<< I see  p:successView="userSuccess"   ......where  this  "userSuccess"    is used ?

its a jsp page ... after ur all work done ur if its  success means (save or anythink) controll will return the modelandview to success page ..

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
02.    
pageEncoding="ISO-8859-1"%> 
03.<html> 
04.<head> 
05.<title>Success Page</title> 
06.</head> 
07.<body> 
08.User Details 
09.<hr> 
10.User Name   : ${user.name} <br/> 
11.Gender      : ${user.gender} <br/> 
12.Country     : ${user.country} <br/> 
13.About You   : ${user.aboutYou} <br/> 
14.Community   : ${user.community[0]}  ${user.community[1]} ${user.community[2]}<br/> 
15.Mailing List: ${user.mailingList}  
16.</body> 
17.</html>

                                              

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Only 250 point u asking this much question yaar !!

points increased to 500

Ur welcome ...
is ur doubt is cleared ??

>>dispatcherservlet u can find userForm  if its not there means thats pgm bug .

which file ? i downloaded the tutorial source code  but not sure where it could be. ....I am expecting somewhere this "userForm"   is  used ......but where ? which file to look at ?


>>>p:userService-ref="userService"

where    "userService"  is searched for ?



From tutorial  we have ....

public class UserController extends SimpleFormController {

private UserService userService;   // is it matched  here ?

Can u tell me this jsp name ....
as per code (formview  this jsp is the userForm)

this jsp page ...

<form:form method="POST" commandName="user">
   <table>
   <tr>
       <td>User Name :</td>
       <td><form:input path="name" /></td>
   </tr>
   <tr>
       <td>Password :</td>
       <td><form:password path="password" /></td>
   </tr>
   <tr>
       <td>Gender :</td>
       <td>
           <form:radiobutton path="gender" value="M" label="M" />
           <form:radiobutton path="gender" value="F" label="F" />
       </td>
   </tr>
   <tr>
       <td>Country :</td>
       <td>
       <form:select path="country">
           <form:option value="0" label="Select" />
           <form:option value="1" label="India" />
           <form:option value="2" label="USA" />
           <form:option value="3" label="UK" />
       </form:select></td>
   </tr>
   <tr>
       <td>About you :</td>
       <td><form:textarea path="aboutYou" /></td>
   </tr>
   <tr>
       <td>Community :</td>
       <td>
           <form:checkbox path="community" value="Spring" label="Spring" />
           <form:checkbox path="community" value="Hibernate" abel="Hibernate" />
           <form:checkbox path="community" value="Struts" label="Struts" />
       </td>
   </tr>
   <tr>
       <td></td>
       <td>
       <form:checkbox path="mailingList" label="Would you like to join our mailinglist?" /></td>
   </tr>
                                              

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>>>p:userService-ref="userService"

where "userService" is searched for ?

<bean id="userService" class="com.vaannila.service.UserServiceImpl" />  u can find in bean configeration xml file

<<<<<<< public class UserController extends SimpleFormController {

private UserService userService;   // is it matched  here ?

This for injection purpose we are define . in we are not using new operater to call another call we are using inject method only used to call another method !!

controller can find ur injected method in bean config file !!

<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />    

Feeling  better now .... have still some more doubts in this tutorial


they said ...

in spring 3.0
>>> <bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />  

>>Using "p" namespace the properties can be supplied using attributes, rather than elements.  

But this way we can't feed  down the values  into the attributes ....is  not it ?  are not  we loosing the values in spring 3.0 for properties ?




 
But we can have the values associated for every properties as below in spring 2.5

<bean id="posCreateIndustryContr
oller" class="com.rockwell.ap.spras.web.controller.PosCreateIndustryController">
<property name="commandName">
<value>PosBean</value>
</property>
<property name="commandClass">
<value>
business.model.XXXMasterBean
</value>
</property>
</bean>      


So,  are not  we loosing the values in spring 3.0 for properties ?

i didnt get ur question clearly ??

What i meant was ...

For  
<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />  

How the values are assigned here  for properties ?


if we chose XML like element structure ( as per you example of   "posCreateIndustryContr
oller"  ) , we see there property  and  value pair....so I am worried how the values are feed ?

>>>>>>>>>   <bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />
How the values are assigned here  for properties ?

ur class is take care of that !!

if u didnt understnad means go for this URL
 U will Know !! some ponit !!

http://www.roseindia.net/spring/helloworld.shtml

They give expalin for

p:viewName="index" />:This is the ParameterizableViewController. With the use of this controller we can view the index.
p:suffix=".jsp" />:-This is  InternalResourceViewResolver. With the use of this we can map this name to an actual jsp page.



<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userservice-ref="userService" p:formview="userForm" p:successview="userSuccess">  </bean>

<bean name="/userRegistration.htm" class="com.vaannila.web.UserController" p:userService-ref="userService" p:formView="userForm" p:successView="userSuccess" />

this format is fllowed by spring 2.0 only not in spring 3.0